Eyeglass-mount.



L E. GRAN L E. A. WEGENER.

EYEGLSS MOUNT.

APPLICATION FILED JAN. 25. 1910.

'UNITED sTATnsATENT OFFICE,

LORENZO EARL GRANT .AND'ERNST A. WEGENER, OF 4IPORIAGE, WISCONSIN.

EYEGLAss-MOUNT.

y Specicatien of Letters Patent. Patented July 19,10, Application filed January 25, 1910. Serial No. 540,067.

To all wwm it may concern.'

Be it known that we,l Lonnxzo EARL GRANT and linxs'r A. Haonxniu both .citizens ol the lnited States,` and residents of Porta-ge, in the county of Columbia angll State of Wisconsin, have inventer? iew and Improved .llyegl:tsss-Minuit; of which the following is a full, clear, and exact. description.

Among the principal objects which the present invention has in view are: to provide fastening devices for securing the lens in the mount, embodying means 'for locking the fastening devices; and to provide a. construction which is simple, durable and ellicient. i f

\"()ue el'nbodinientof the present invention isidisclosed in'theI structure illustrated in the .accompanying drawings, in which 'like characters ot' reference indicate corresponding parts in all the views` and in which-- Figure 1 is a front elevation of a nose bridge for eye-glasses, having secured thereto fragments of lenses therein held` by mounts constructed and arranged 'in ae- .cordance with the present invention; Fig. 2 is an enlarged detail view in horizontal section, of a fragment of the mount illustrated in Fig. l; Fig. is an enlarged detail end view of the expansible hollow screw shown in Fig. 2; Fig. 4t is an enlarged detail of the mounting for spectacles, showing in section the construction of the bow pivot, and Fig. 5 is au enlarged view in detail, showing in section the construction of a nose glass and the spring` mounting. stud therefor when formed in conformity With this invention. l.

Serious inconvenience is experienced by wearers of eye-glasses and,spectaeles as at present constructed, in the fact that the small screws used for securing the lenses in position in the mounts become loosened, and when frequeiftly tightenedlthescrew threads in' the anchlir straps become worn and stripped. The 'anchor straps are necessarily thin and their screw threading caypacity is therefore limited. A. further in'- convenience"which has been experienced by wearcrs of spectacles and nose g la..sses,y where the lenses have,been held in claw mounts, has existed in the fact that if a Unless considerable pressure is applied upon vthe clamp 6.

-shank `of a screw l0.

the fastening screws, the same will not hold in the threaded perforations provided for them except when the shank ends are slightly protruded and headed. -'lhis last is an operation which can only be safely performed by a mechanic operating in the line to which the art pertains, a'nd then often breaking the lens owing to the riveting being too. close. y

By the present invention the above nnentioned objections are wholly obviatcd, as our expansible screw entirely removes all strains from the lens. f

The nose bridge- 4 shown in the drawing-i is of the usual type, having brat-es 5, lor adjusting the horizontal axis ol lthe lens. and side clamps (l, (i. In the present instance the clamps G, are provided with perlorations sufficiently large in the one clamp to pass a screw I7, while in the other clamp the perforation is .tapped to provide screw threads to engage the threadsl formed on the shank of the said screw 7. the 'clamps t3, G is inserted a lens ti `prior toplacing the screw 7 in position and screwing the saine intothe tapped perforation ot' The screws 7 are provided with a centrally bored hole t). 'lhishole S) is suitably tapped to provide a screw thread suited to engage the screw threads on the The shank of the screw lOxi's tapered, as illustrated in Fig-2 of the drawings. The upper end of the A'shank adjacent to the head of the screw l() is gradually enlarged so that when the screw l0 is set up in the hole 9, a considerab'le outward pressure is exertedv on the walls of the screw 7. VIt is to permit the walls of the screw 7 to spread that we have formed one `or more. slots 1l in the shank of thescrew 7, leading .into the hole t) and extending lengthwise of the shank. When now the screw '10 is driven into the hole t), the enlarged upper section thereof spreads the Walls of the shank ofthe screw 7, increasing the diameter thereofby jamming the same hard against the side of the clamp (i. The screw 7 isslotted, as at 12, to receive the usual screwdriver, while. the screw 10 is slotted, as at 13, or'the saine purpose. ylfhe screw 7 is driven in place until snug against one clamp (l. The screw 10 is set up tight against the other clainp'G. In the firstpart of the operation the screw 7 istightcned until the clamps t), are drawn tliyi'dy but gently upon the interposed lens liet weert S. The screw l0 is then inserted within the hole 9 and driven home. In the lasttwo turns of the screw 10 the increased diameter .of the shank thereof spreads out-Ward, as

above described, the walls of the shank of the screw T, jamming the same against the threaded wall of the clamp (5. This effort is exerted along the lines of greatest resistance on the part of the clamp, any movement in avoidance thereof having to overcome the tensile strength -of the metal of which the said clamp is composed. Further, in the operation of spreading the shank of the screw 7, t-he threads thereof are expanded so that they bite upon the threads of the screw l0. These movements of the two. screws and clamps result when the screw 10 is finally seated7 in locking:r the members in fixed position.

' lt is obvious that only when glasses are provided with a mountin;r of the nature described aml illustrated, that in the event of looseningr of thc screws T and lt), these may be tightened without neeessitating any great care in the operation to prevent thev brezil:- inf.r otI the lenses. Therefore, the operation may bc performed by the wearer, though unskilled in the. use of tools. lThe many inconveniences mentioned are thereby obviated.

In Figs. land 5 of thc drawings -is shown the adapta-tion of our expanding screw and wedge screw pin as applied to spectacle and' nose glass mounts. ln these forms the screw 7 is expanded directly againstthe studs 14, 14a: In the case of the spectacle mountr the screws T and 10 are both exposed and may be manipulated at any time. In the nose glass mount the screw l() is driven home to scat the screw 7, and then the lens S is mounted between the clamps t, and therein secured by the screws 7 and 1,0 in the manne above described and as shown in Fig.. 2.

llaving tlms deseril'icd our inventiomwhat we claim as new and desire to secure by Letters Patent istl. An eye glass mount. co1uprisingl lens clamping members adapted to extend on opposite sides of said lens, one of said members having' a screw threaded perforation and the other of said meinlars` provided with a smooth and enlarged perforation in line' with the said threaded perforation; an cxtended headed split tubular screw having external threads adapted to pass through l the said smooth perforation and to engage the said' threadedperferation of said clamping members todraw the said clamps upon the said lens; and a tapered; member adapted to be inserted within sai split screw to spread the same against the clamping member having said threaded perforation.

2. An eye glass mount, comprising leus clamping members adapted to extend on opposite sides of said lens, one of said members having a screw threaded perforation and the other of said members provided with a smooth and enlarged perforation in line with the said threaded perf0ration; an

extended headed split tubular screw having external and internal threads. and, adapted to engage the said threaded perforation of said.clampingl member to draw the said ciampingauemhers upon the said lens; and a tapered screw adapted to engage the said internal threads of said split screw to spread the said split screw against vthe sides of said threaded perforation.

3. An eye glass mount, comprising a plurality of separable perforated inendwrs.y the perforation in one melnber whereof is provided with a screw thread; screw adapted to engage. the threaded perforation and having a head to overlie thev said separable members to draw the said members together by driving said screw in .said threaded perforation; and a tapered.'

member adapted to he`inserted in tle said tubular screw at the split end thereof to force the said screw into holding:r Contact; with the said threaded perforation.

4. An eye glass mount, comprising a plurality of separableperforated members, the perforation in one member whereof is provided with a screw thread; la split tubular screw having external and internal guide threads at the split end thereof. and at the opposite end an extended head; and a tapered expanding screw adapted tobe inserted within said tubular screw to expand the split portion thereof against the sides of said threaded perforation.

ln testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

LORENZO ERTL lRANT.

ERNST A. WFJINER.

Vit'nesses: l

A. llomirzs, Joux l'LGnxNT.

a split tubularv 

